A regular expression is a useful search assistant. It comes to your help when you don't know what you are searching for in the text or code, but you do know what it should look like. For example, if you do not know the specific numeric combination that some expression contains, but you do know that the combination has exactly 8 digits. A regular expression is practically a text string that fits a set of strings based on certain syntax rules.
In Mergado, regular expressions help you to separate parts of a text or to search.